2012/6/29 Rajeshwari Shinde rajeshwari.s@samsung.com:
MPLL clock-out of Exynos5250 Rev 1.0 is always at 1.6GHz. Adjust the divisor value to get 800MHz as needed by devices like UART etc
Signed-off-by: Hatim Ali hatim.rv@samsung.com Signed-off-by: Rajeshwari Shinde rajeshwari.s@samsung.com
Changes in V2: - None Changes in V3: - Incorported review comments from Minkyu Kang. Changes in V4: - None arch/arm/cpu/armv7/exynos/clock.c | 12 +++++++++++- arch/arm/include/asm/arch-exynos/clock.h | 3 +++ 2 files changed, 14 insertions(+), 1 deletions(-)
diff --git a/arch/arm/cpu/armv7/exynos/clock.c b/arch/arm/cpu/armv7/exynos/clock.c index 330bd75..dbd5f11 100644 --- a/arch/arm/cpu/armv7/exynos/clock.c +++ b/arch/arm/cpu/armv7/exynos/clock.c @@ -98,7 +98,7 @@ static unsigned long exynos5_get_pll_clk(int pllreg) struct exynos5_clock *clk = (struct exynos5_clock *)samsung_get_base_clock(); unsigned long r, m, p, s, k = 0, mask, fout;
- unsigned int freq;
- unsigned int freq, pll_div2_sel, mpll_fout_sel;
switch (pllreg) { case APLL: @@ -155,6 +155,16 @@ static unsigned long exynos5_get_pll_clk(int pllreg) fout = m * (freq / (p * (1 << (s - 1)))); }
- /* According to the user manual, in EVT1 MPLL always gives
- * 1.6GHz clock, so divide by 2 to get 800MHz MPLL clock.*/
- if (pllreg == MPLL) {
- pll_div2_sel = readl(&clk->pll_div2_sel);
- mpll_fout_sel = (pll_div2_sel >> MPLL_FOUT_SEL_SHIFT)
- & MPLL_FOUT_SEL_MASK;
- if (mpll_fout_sel == 0)
- fout /= 2;
- }
return fout; }
diff --git a/arch/arm/include/asm/arch-exynos/clock.h b/arch/arm/include/asm/arch-exynos/clock.h index 90271f1..bf41c19 100644 --- a/arch/arm/include/asm/arch-exynos/clock.h +++ b/arch/arm/include/asm/arch-exynos/clock.h @@ -596,4 +596,7 @@ struct exynos5_clock { unsigned char res123[0xf5d8]; }; #endif
+#define MPLL_FOUT_SEL_SHIFT 4 +#define MPLL_FOUT_SEL_MASK 0x1 #endif -- 1.7.4.4
Acked-by: Joonyoung Shim jy0922.shim@samsung.com